Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6506688f927520eb4f94716ab8cd0867b6760c0357b3b6e68dd76ce4887bc9e6' 
  AND token = 'mo200ED84Lg1oS6+fb8Nsg21ksh7Mp8pP/eRX/4XP5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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