Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568740fc5743336ce19f26b844018c55fa0e8e15c9610523457b817112822aa1' 
  AND token = 'wdPoOdLLmUxYaxWSNhcud2T65OiMeWyLltYcD0lb3HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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