Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451e2e6f9856df63c82b98eeaa5d09c27cdabdfb92ddf2dbe134430e9271e296' 
  AND token = 'm8lMDgBQzeC9uvMnGI4LcFTW+N50WAvKUYNopmGrviM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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