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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2208dffd751940035f6b2936cd267a5ca004dd4333b4eb518dccc9591f211846' 
  AND token = 'elDdDmsTfWtT3bDEAq+MkMQsPp63d/MN+7wLzTdXmR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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