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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6eb5ca9aeaa5bd2669b7f87485759ddb8060f77e6d84515f4a465fe4c7468961' 
  AND token = 'mNYcKcSOD9I6D9M4ivpljNw2MtHnQGPR7NmvJrN64aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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