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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '69f8b1c8c084719019cfc044eec6e5b9ab4255953d8160d3211ff115d28a24f7' 
  AND token = 't5e5fG8JoFxDjW5XOBBKvIdokuRMjm3PirpMjr8ZIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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