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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72adbc82a0c5f30126dbbc20d2b895d85a3dfc8cbd81a8351ed59cbc63aad7fa' 
  AND token = 'TqMrJMWctPgh8/+gQjBeMicG5gnLp36yjf9BljI1UUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}