Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94851cc5eeab327e76d2cf882abc461aed1d3ed276f9d8ed7dd95b27d304666' 
  AND token = 'c4c2Ry1HhOEpvEmNFAVBA2rJ1ihx+YqNGuFvTOz1I+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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