Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3563c95e94be884c6ccbd36fa9c2d653ce5bfa7c69dcb1e5e695f0654fcb3b' 
  AND token = 'wK6UNVbH4fBMJVnmGbDswTKyCWPeOI0PJCWKexFGxXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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