Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a88c9a0e3cf033b676dc7546502d994b59f736a4c81660c39f33ead176bcc21' 
  AND token = '2SLjy7iTc3RjTq0jp7dqiFrFE3nf/Ys+VLC2xaijvrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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