Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3d4538cad3b203502c1106defa8d00b18ccc8c7c3bc5d91dfa34bce12400e3' 
  AND token = '8WhoRcOGCJyLMbe1KL8eI/ARDt02sT61G6JgGT8K1iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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