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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b9e43184dd5c36fa4ff2f8fa41f4f168ffb796ab6521d0c382acfe74fa8a6c6' 
  AND token = '9Yiv4RoCyCtOCoedoU/0QsW5Y+mUAXY0H3gH+WOX9Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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