Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39ad5a688f24bed2914d0cbdb0064a360ac16511732d12def1f1a4db9f95901' 
  AND token = 'oA4qT3sPEHA05HpKNftFFP9UzLdICZd0yNzza3EDe7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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