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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0dd23b037509800415653b564628b9f481130ae6dd0ef7803f52f16d0fb6b99b' 
  AND token = 'rpdqLYSRN4ECyHyvEl5ZNKeDR4DfFCNrrjd9WAk+p9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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