Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d431f63d1a317efbc50c86b1d43030a11d535986d0044edab06c0243ad7bf36' 
  AND token = 'c1iBXXLvPACy40/ZF8fccjJSRawsmFQYh9OP7zqUi0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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