Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5ddd0ac79aedd02937a9591608f1f93ff58f0a95a8653aefed77f7d4a3a285' 
  AND token = 'SBdzzBMa7F2j+O4fcprTkdPlmUs9jW9oPo85UCiRnCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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