Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7397628e0997ffb7b07b220c2688850e1f70a39131de38bd2d9ccd7160bb4b3' 
  AND token = 'vBj0GNGRhgILVd8SfAG8wipsrFe6iB7YXI4cmADmCjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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