Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c6c95904b7449cba137ed7f533b978bfcf2951a5b6249e23c2368fc810e1f5' 
  AND token = 'N4brPHIsPCrqWs1gRNxcm5eAu9flhVO6pWZHHgyUbJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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