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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '566b3b430a0d4cef43bee54780a4a02bb13d9a7db5edf5130bc05c4b3bcd1861' 
  AND token = 'iqnMf//lNkQ77yQ/Vci2ou6OTRTi8BtSjeBru9Ul1w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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