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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fab1daa4de998201870e29a8610d4810fa348ccc7f1d8ec2ed8ac89eb43b9b3e' 
  AND token = 'CvPZuF0o+1oLhC9AzQnXcVJfeHK1nJASRiLsO+gp4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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