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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f8fe9bafbab883528d3a83f13f8327ae760ae14e94ee42b199a3571652c5897f' 
  AND token = 'XOSyURRd7j4FwoUtt6e8EfZOaOqDk1DezaFKHJAH03Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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