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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12d0d19a358c922bea5ab14a85d4799ff6633681f2a32c334b5e742fee575999' 
  AND token = 'l8F/3sfnbOAu3FhbssKNNL1sqEj77g15zkVikmrspZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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