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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad536c53200b655eb83a92e06b766fe8718e9c354c0a454635314f7771be64f2' 
  AND token = 'dhbkZNr4Es/C8ahJB2E5uRsxmn/Y6fYS9k9bcEGGFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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