Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03b1d7783359a283f752d73d5df78d950305939da733dbe6b6134b83fc8fbdc' 
  AND token = 'MGDpMfApswtMXg8PWjEbaYo3NfyQPuy0edfEzXdc9M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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