Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4047967c7036ce2d55a624460ad86d0f65a9c20db8dc1fab4d49fbdf0d0d0be' 
  AND token = 'cccIg1Dk3OlBHsiHatRpWyEsMuJMUycVHfKZXNJKUTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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