Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18e6609a727753fe6d2be377a9e01cd36b637271644a933f32f4d8627f4ca76' 
  AND token = 'D+YIB5ilKGOS2VwehBSSQ+Udg6ANIuMc65tMV6fV3Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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