Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fdf606387e0dd80ec3139fe4ba151f3372572f33cdfce51f0f49b3f8d1fec1' 
  AND token = 'LXqVuAcH8RFcMz7zlxIMOwk9ge4Bu911NmOFnEEco7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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