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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a96f097b2d9af62d309f299b728ab4ebf53254ad90953a0aa0634451d7e383cd' 
  AND token = 'u2p+Xv2FPunfI8Po9IV02U1Rr1VVsJXR+54IIhauxZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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