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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b73831eb0a3cb75736d7d3677111e1511ba913e4c2b105057eab3b8e00fe1a8' 
  AND token = 'TJtn+zKMfklDtTIZ0N3gcJ+Ub9MZ8SwmyV4wFcz/fXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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