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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'faadba5c6bdf9b14dfe6f0ef5f17a45a2bf4f99a8d0f6394008fb1fbef8faeed' 
  AND token = 'pcc/dux5LLKu2YbJSu5aGl/xhSCyVBT4y6WWK39rZ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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