Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f28ea27af286b72cb6505bfee7b0902de6623e23fea2f2f57ca8865a58148cb' 
  AND token = 'iXkn7CS+vLLYFp6Yt+0hgYSjBbgxRZWaeEK67CeDJzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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