Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1883144b2bc1d3f70b8c14f3c2eba0de68826020bbbb0eea22baa1ed0c297e4d' 
  AND token = '6u9GWioHP/4QsMd2hNBl8l51UEVIG78Oxi1BSrON2KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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