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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d8039060a0232641979d693307398d357208346884e29d03328ca8902eecf33' 
  AND token = 'A9A/QYY1RWtMSIFWcsoWI7Xo6n7TYBcKrPdcdgetFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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