Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b684837cf3cb34a9340cf5ac97c5f1c3bff7fff1ca5217fa34c95888f5594496' 
  AND token = 'h8JRP2kOMGhTbgLA7BtuqDhwZU7VpMb3rcV7Rr+E0hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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