Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c5329147d27e95a3fe1825ae3d54c4e76f2ddf3baa7daec4b4717b60025d18' 
  AND token = 'fjVf3VQq5DagjeEICT1RG4uPr/TUrmiDHCZoqooGKeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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