Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da14cfa3479d7baba8d90314d5233482d9ec20fa6d0b2a707a49ea74f2d47ad3' 
  AND token = '8Y/zml/COYNniTCtLaRBjHg8rxbKJ05gqS5Gc9Xs/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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