Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d432ee28c44e0c5c2fdf06290dd0442d50624b836495307af1e9555c1ee239' 
  AND token = '/P84/jTlZJ7xBq4PKkZH6DvyttvajpDi2kzT1bjH/r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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