Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3a416b248ab30bcdf910b1cd1b6f6b1fff6f4d0068c2cfba9cf3ae174d9472' 
  AND token = 'iBd/en+QzPm46LzGhicxhRVNhusUjR7tqLlWfPwfApU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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