Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8865e24862bf4bfc129c0cedea8761d5dea56e0b7c6b51f930aa02fe58290ff' 
  AND token = 'FmQQzhIFHIDyjUemkH3sodMm6VmR/GmwaBpVQ9D5gLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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