Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f55a86dc28ace39994daece37abef6644d92ab26d9b2f0825a4b6fddf151427' 
  AND token = 'G7jesgsMTasxbVnvCBaOwSrGWZYtIaBbcH1L/5PCEaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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