Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521cfd44615050ced36f13f78775b1852708387f92bedff2026e89e24368e33f' 
  AND token = '54UisAeM591n51/5412Lpr46qdUDBUwtOgZNlDuRdZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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