Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431a20e1f61f6c0f0ed4812d9a360b35252e82475098a64fa32e3f9ce8782cfb' 
  AND token = 'VN3m1y4XGMPYbu5VdbIK88T+PT7jeCiG4lXAT+plqYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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