Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f278ec650dec00c0cad459153e71aa262a7000aa448e0cb0d33c45f4dabcc490' 
  AND token = 'QHGRMe7/xvWELJNmlWSKslY7iC7HEz6c3GooA+2toxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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