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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22c22d61d521427b98bab85f006067979d9cf2cee8ed9a43e4ea96dcb5f38866' 
  AND token = 'ViAX3n5WKwZ5Xa4qIsPxj98dTemz/E8nKhbHJrF9ssM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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