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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0346b1a65792b356f79f7b3aa81e71e72ad6c9cbc2110d430180460d689da9ac' 
  AND token = 'ueL6qNUchpI0CZtPvHIU+BfiQJaycybP1rN7Xw1RT30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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