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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a3a61c30c3c62f2d817b30ece3dafce73903be4ad5cde8742b38ff02810b286' 
  AND token = 'KpznvUaSyKuEXdTVq5d6bQbWYM9IE0ArM6RAczwT85s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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