Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a644ef0490c7aff04da9cff3bb4894b54dc482d43d56e3b1b8eb993c204de6b2' 
  AND token = 'Pa59Pl8/JkwQYhCfFaL1QxWf2zrCJ60aK5KLNvNwUnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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