Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8420ad3ebb8860f2a54b699ebd6a593548a8a09054a6aa5db9840e0ed86684' 
  AND token = '1EHJOi2cr550jb82AnA9EdG7gbhRlSWrId/2XohEYTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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