Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc2d6a73a4052aed05537ee9dcc6284aee641aa0280e4020d1768a1389f294b' 
  AND token = '3zWJyodMqXLmdrIydSM0sMYOmjBJap3vi3yhYCuKgfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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