Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187197db2b7289b3a73417aafe0a26110cf7368512e6fe38a6f9cd9113b4ef5c' 
  AND token = '5dfXlIQotjfzQS1ShB6P8ttKC3h+4cDifCOp4giHG7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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