Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7010c06dac7652f36df991d4d20ba3acd724271784658950fc94c616efd05e3' 
  AND token = '3XOhdCFBVLPKyUuhXNyOAtWarUl0rTx76EmyzMBVpLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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