Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268754b7b6c90468139172cf365b74338b2266600e77e7bffc8897eeda804c03' 
  AND token = 'xmEcuH54eI+LWqb91LJ9OPAIePOnKyp3jZSMRGv/lXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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