Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2f75db8cc8a47801a4efa3b3fac8d386db99277ad46c3b4d62cff0894a6cc5' 
  AND token = '/jlAP4oJVEkYvfGuC2pGKAoAndoGxcMVo59QtqQ1GaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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