Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff42ef2211b9a24481f9dad6ca5691314642d8c4ad49e5561ef21b00c53e5e6b' 
  AND token = '8tTDRl6FmRQ9iWZcLQDaK1fhwUCxd1oGJ5W7feOZoe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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