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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '456389b4722131268c54bf993e016d3b00a1c890a037b94ff6c32e0d06c6d5bc' 
  AND token = 'nmHU98EDDboulriaiaC1dlbtCnU16eD6ZP5tkKHODaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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