SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00e69119c38605113c680150ba8e20770fecda158c47db349e81577d5f9b33c9' 
  AND token = 'Wr+VKyZeimbFDwZvzqpQPwtRaas5HQOz82UTB+vI568=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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