Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3fdb2a82c45eeb37aa9b40f400137c49e96f9f46c1810bbee90a07a52bccce' 
  AND token = '/0svzYvYiQD6PFsF08o2MTqcusVr2bLQLZhkvVcgm/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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