Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd0d2a63e65b86af0d84a796e508dfe2d70133be49ebcfbead3fa3d9c52a60d7' 
  AND token = 'h3M4zjUIWycSZ6BOHGacDcuKBW9KoPxrnQrdNCZC6h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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