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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53bee141d02b9447549ca9bcf1fb636378de4d22b7e8d36cc82efa9c77f3e243' 
  AND token = 'R5itjKpa1oRGnh6KbUwzn+QTzHaP8Q2NSgdmX8cCuIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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