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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7431060e34ae3512016cac2e7ee3db8de56c3076e130fb23fc97fde5ca6fef7' 
  AND token = 'nK7ENU84Vlxb1k2VphFAquPvEQQZ/TBW1yAcn5QdLvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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