Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0ba06ff998e9c5c563374c279a96e0aebf061f2d02fb0b832c1718578640ee' 
  AND token = 'x7KkLUmyLE2xxvxj9tdZtwOKNG0mAVGfuv4+3iW1eCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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