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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '51025ef51b7ab7e894398145e1df72efa6c57edeb67cb496fa7407d99cbbb858' 
  AND token = 'mlg3KvXloXcFB/E/YT+y6xKkEOw5GmGUUfrf685i4bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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