Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cad570ad37515eb0ff7ce09a7bd84a31638f8d7d3857404586a918559b5b91' 
  AND token = '4OqsIDGhrzy4rrGSxICzAfgr8ncBLRGmXRyfpVq15TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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