Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ec3c2245e2cca6f894af9516f063a697c1b19b3e8979970811f413766a86f4' 
  AND token = 'vLg9aU1RfjUqJ4Wuv7rdXpEShntrQuJMMqgSibZ4Ngo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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