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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c803d3d0f6f469d09997aae6acad3808cd766ea36aa5804e24d619f4dedd3394' 
  AND token = 'JmBoe9Om0nNIXEoGWqK/dnCqRYI5BULYMCzX2mKt6Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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