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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a0dc40b026eb64a3c6d630a6eb2d7e5f3aac376f6d8c323118f87a25199c7d7' 
  AND token = 'xn0GhCVK0DFSpH1OyqluxqhstgAlqYAuh3VDuJpyfpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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