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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7b4b87c4bad98db01f11dd8c99c8c54c0679a52f5fb80ad48cb1e5e6a7aba66' 
  AND token = '0yUM5UDBYlxDYP/xY0Zagzotfc0aJh6amFMNKbzviA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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